/* 1. 重置默认样式 (Reset/Normalize) */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* 2. 设置 html 和 body 全屏 */
html,
body,
#root {
  width: 100%;
  height: 100%;
  /* 可选：防止滚动条抖动 */
  overflow: hidden;
}

/* 3. 定义 CSS 变量 (自定义属性) */
:root {
  --color-primary: #007bff;
  --color-success: #28a745;
  --color-danger: #dc3545;
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-base: 16px;
  --border-radius: 4px;
  --box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* 4. 设置基础样式 */
body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.5;
  color: #333;
  background-color: #f8f9fa;
}

/* 5. 常用工具类 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* 6. 链接样式 */
a {
  color: var(--color-primary);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

/* 7. 按钮基础样式 */
button {
  cursor: pointer;
  border: none;
  border-radius: var(--border-radius);
  padding: 0.5rem 1rem;
  font-size: inherit;
}
button:disabled {
  cursor: not-allowed;
  opacity: 0.6;
}

/* 8. 表单样式 */
input,
select,
textarea {
  border: 1px solid #ccc;
  border-radius: var(--border-radius);
  padding: 0.5rem 1rem;
  font-size: inherit;
}
input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--color-primary);
}

:root {
  font-family: system-ui, Avenir, Helvetica, Arial, sans-serif;
  line-height: 1.5;
  font-weight: 400;
  color-scheme: light dark;
  color: rgba(255, 255, 255, 0.87);
  background-color: #242424;

  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  font-weight: 500;
  color: #646cff;
  text-decoration: inherit;
}
a:hover {
  color: #535bf2;
}

body {
  margin: 0;
  display: flex;
  place-items: center;
  min-width: 320px;
  min-height: 100vh;
}

h1 {
  font-size: 3.2em;
  line-height: 1.1;
}

button {
  border-radius: 8px;
  border: 1px solid transparent;
  padding: 0.6em 1.2em;
  font-size: 1em;
  font-weight: 500;
  font-family: inherit;
  background-color: #1a1a1a;
  cursor: pointer;
  transition: border-color 0.25s;
}
button:hover {
  border-color: #646cff;
}
button:focus,
button:focus-visible {
  outline: 4px auto -webkit-focus-ring-color;
}

@media (prefers-color-scheme: light) {
  :root {
    color: #213547;
    background-color: #ffffff;
  }
  a:hover {
    color: #747bff;
  }
  button {
    background-color: #f9f9f9;
  }
}
